Periodic Table
49
In
114.82
Indium
Post-transitionSoft; ITO transparent electrodes for touchscreens.
Electronic Configuration
[Kr] 4d¹⁰ 5s² 5p¹or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s² 5p¹
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
18e⁻n=4
3e⁻n=5
Properties
Atomic number
49
Atomic mass
114.82 u
Category
Post-transition
Block / Group / Period
p · 13 · 5
Valence electrons
3
Oxidation states
+3
Electronegativity
1.78
Atomic radius
156 pm
Ionization energy
558 kJ/mol
Electron affinity
29 kJ/mol
Melting point
430 K / 157 °C
Boiling point
2345 K / 2072 °C
Density
7.31 g/cm³
State at 25 °C
solid
Personal Notes
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